Irving adams



(No Model.)

W. I. ADAMS.

PHOTOGRAPHIG SHUTTER.

No. 536,253. Patented Mar. 26, 1895.

H/ ATTORNEY UNITED STATES PATENT OFFICE.

XVASHINGTON IRVING ADAMS, OF MONTOLAIR, NEW JERSEY, ASSIGNOR TO THESCOVILL & ADAMS COMPANY, OF NEW YORK, N. Y.

PHOTOGRAPHIC SHUTTER.

SPECIFICATION forming part of Letters Patent No. 536,253, dated March26, 1895.

Application filed August 7, 1891.

To aZZ whom it may concern.-

Be it known that- I, WASHINGTON IRVING ADAMS, of Montclair, in thecounty of Essex and State of New Jersey, have invented a 5 certain newand useful Improvement in Shutters for Photographic Cameras, of whichthe following is a specification.

This invention relates to shutters for photographic cameras, and has forits object to simplify the mechanism and render it positive andefficient in operation.

The improvements consist in certain novel devices and combinations ofparts, all as hereinafter fully described in detail and pointed out inthe claims, reference being had to the accompanying drawings formingpart of this specification, upon which the several letters of referenceindicate like parts in all the figures.

In said drawings, Figure 1 is a front view of the shutter mechanismembodying my improvement. Fig. 2 is a front view of arotary stopemployed in connection with the shutter mechanism proper. Fig. 3 is afront view of the shutter detached. Fig. 4 is a side sectional.elevation of the shutter mechanism, the plane of the section being atthe dotted line z-z, Fig. 1. Fig. 5 is a horizontal section taken online y'y, Fig. 1. Fig. 6 is a horizontal section taken on line mm, Fig.1.

Thelens tube E is composed of two sections, the main section beingattached to the front block of the camera and the other section beingsecured to the forward. end of the main section. The outer section ofthe lens tube has mounted upon it a shallow box composed of plates f farranged one in front of the other and united to a rim f interposedbetween them. This rim has an openingin one side through whichprotrudesthe edge of a stop fconsisting of a plate provided with a number of holes and pivoted at its center to the box ff f By turning thestop, any one of its holes may be brought opposite the center of thelens tube.

The rear of the stopf has a number of small recessesf into which aspring detentf fastened to the rear plate f of the box f f f may enterwhen one of the holes of the stop 50 is opposite the lens tube.

Serial No. 401.975. (No model.)

The shutter consists of a plate f pivotally connected by a pin passingthrough a hole f to the forward plate f of the box f f f This shutterhas a single opening which may be brought opposite to the lens tube ormay be made to pass the lens tube. A pin f extends forwardly from theshutter through an arc-shaped slot f formed in the front plate f of thebox ff f and into a slot or notch formed in a lever f which is fulcrumednear the lower end by a pin f to said plate f This lever has combinedwith it a spring f which at the lower end is fastened to the lever insuch waythat it cannot move laterally without bending,but can moveforwardly and baclc wardly. This is accomplished by fitting the loweredge of the spring to a bracket f and passing through the bracket andspring a pin f. The tension of this spring maybe varied by verticallyadjusting a block f 15 which slides along the lever f and is forked toembrace the spring f Obviously, by adjusting the block f it will reducethe length of the spring which will be active and may be adjustedconversely from a downward adjustment of the block.

The upper end of the spring f may be fitted into either of two notches ff" formed in a plate f which is fastened to the front plate f of the boxf f f When the spring is engaged with the notch f, it will tend to swingthe lever f to the left and consequently rotate or oscillate the shutterto the left. The engagement of the spring with the notch f will cause areverse movement of the lever f and shutter.

It onlyremains to explain the detentswhereby the shutter is retained inposition. They consist, as here shown, of three 1eversf f f, allfulcrurned to a pin f which passes through them and through the twoplatesf'f of the box f f f, being engaged with a tapped hole in the backplate f. The levers f f are-provided at or near their free ends withlugs that extend over the upper edge of the lever f so that when thelever f is raised, the other levers f f will also be raised. Springs ffastened to the box f'f f and impinging against the lovers f f impelsaid levers downward, and, as these levers bear upon the lever f, thelatter will also be impelled downward by said spring. Each of the leversf f has a projection f which will obtrude itself to one side or theother of the upper end of the lever f The projections f of both levers ff will, when the shutter is set be on the same side of the lever f Byraising one of these levers the shutter will be permitted to make apartial movement and afterward by raising the second lever the movementof the shutter may be completed. It the lever f is raised, it will raiseboth the levers f f 21 and allow the shut ter to make its entiremovement at once.

WVhat I claim as my invention, and desire to secure by Letters Patent,is-

1. In a camera shutter, the combination with a lens tube, of a shutterplate, a pivoted lever for operating the shutter plate, a spring securedto the lever, a stationary plate provided with portions on oppositesides of the center line of vibration of the lever suitable for engagingwith the free end of said spring, and detent mechanism for holding theshutter plate in an adjusted position, substantially as specified.

2. In a camera shutter, the combination with a lens tube, of a shutterplate, a pivoted lever for operating the shutter plate, a spring securedto the lever, means carried by the lever for adjusting the tension ofthe spring, a stationary plate provided with portions on opposite sidesof the center line of vibration of the lever suitable for engaging withthe free end of said spring, and detent mechanism for holding theshutter plate in an adjusted position, substantially as specified.

3. In a camera,the combination with a lens tube, of a shutter, a mainlever for imparting motion to the shutter plate, a spring for actuatingsaid lever, a stationary notched plate with which the spring may beengaged in either of two positions to cause the main lever to reversethe movement of the shutter and levers f f for holding the main leveruntil it is desired to operate the shutter, and the lever f forreleasing said levers, substantially as specified.

i. In a shutter mechanism for cameras, the combination with a lens tube,of the pivoted shutter plate having a pin or projection, as f, theslotted lever, as f engaging said pin, the spring, as f, adapted to beset so to move said slotted lever in either of two directions, thestationary plate, as f, having notches for holding said spring in eitherof two positions,the levers, f f held by springs and having projections,as f, adapted to engage the free end of the slotted lever, and to beseparately released therefrom, and the lever f for causing said levers ff to simultaneously release the slotted lever, substantialiy as and forthe purposes set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WASHINGTON IRVING ADAMS.

Vitnesses:

HENRY P. SEE, WILLIAM PROOTOR.

